mirror of
https://github.com/git/git
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25b8fb1e49
It is especially useful for Stage/Unstage Line, because they invoke full state scan and diff reload, which originally would reset the scroll position to the top of the file. Signed-off-by: Alexander Gavrilov <angavrilov@gmail.com> Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
519 lines
12 KiB
Tcl
519 lines
12 KiB
Tcl
# git-gui diff viewer
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# Copyright (C) 2006, 2007 Shawn Pearce
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proc clear_diff {} {
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global ui_diff current_diff_path current_diff_header
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global ui_index ui_workdir
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$ui_diff conf -state normal
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$ui_diff delete 0.0 end
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$ui_diff conf -state disabled
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set current_diff_path {}
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set current_diff_header {}
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$ui_index tag remove in_diff 0.0 end
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$ui_workdir tag remove in_diff 0.0 end
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}
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proc reshow_diff {} {
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global file_states file_lists
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global current_diff_path current_diff_side
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global ui_diff
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set p $current_diff_path
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if {$p eq {}} {
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# No diff is being shown.
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} elseif {$current_diff_side eq {}
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|| [catch {set s $file_states($p)}]
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|| [lsearch -sorted -exact $file_lists($current_diff_side) $p] == -1} {
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clear_diff
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} else {
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set save_pos [lindex [$ui_diff yview] 0]
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show_diff $p $current_diff_side {} $save_pos
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}
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}
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proc handle_empty_diff {} {
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global current_diff_path file_states file_lists
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set path $current_diff_path
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set s $file_states($path)
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if {[lindex $s 0] ne {_M}} return
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info_popup [mc "No differences detected.
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%s has no changes.
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The modification date of this file was updated by another application, but the content within the file was not changed.
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A rescan will be automatically started to find other files which may have the same state." [short_path $path]]
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clear_diff
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display_file $path __
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rescan ui_ready 0
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}
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proc show_diff {path w {lno {}} {scroll_pos {}}} {
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global file_states file_lists
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global is_3way_diff diff_active repo_config
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global ui_diff ui_index ui_workdir
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global current_diff_path current_diff_side current_diff_header
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if {$diff_active || ![lock_index read]} return
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clear_diff
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if {$lno == {}} {
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set lno [lsearch -sorted -exact $file_lists($w) $path]
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if {$lno >= 0} {
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incr lno
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}
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}
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if {$lno >= 1} {
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$w tag add in_diff $lno.0 [expr {$lno + 1}].0
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}
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set s $file_states($path)
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set m [lindex $s 0]
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set is_3way_diff 0
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set diff_active 1
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set current_diff_path $path
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set current_diff_side $w
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set current_diff_header {}
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ui_status [mc "Loading diff of %s..." [escape_path $path]]
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# - Git won't give us the diff, there's nothing to compare to!
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#
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if {$m eq {_O}} {
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set max_sz [expr {128 * 1024}]
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set type unknown
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if {[catch {
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set type [file type $path]
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switch -- $type {
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directory {
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set type submodule
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set content {}
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set sz 0
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}
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link {
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set content [file readlink $path]
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set sz [string length $content]
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}
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file {
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set fd [open $path r]
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fconfigure $fd -eofchar {}
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set content [read $fd $max_sz]
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close $fd
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set sz [file size $path]
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}
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default {
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error "'$type' not supported"
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}
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}
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} err ]} {
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set diff_active 0
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unlock_index
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ui_status [mc "Unable to display %s" [escape_path $path]]
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error_popup [strcat [mc "Error loading file:"] "\n\n$err"]
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return
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}
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$ui_diff conf -state normal
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if {$type eq {submodule}} {
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$ui_diff insert end [append \
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"* " \
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[mc "Git Repository (subproject)"] \
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"\n"] d_@
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} elseif {![catch {set type [exec file $path]}]} {
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set n [string length $path]
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if {[string equal -length $n $path $type]} {
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set type [string range $type $n end]
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regsub {^:?\s*} $type {} type
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}
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$ui_diff insert end "* $type\n" d_@
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}
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if {[string first "\0" $content] != -1} {
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$ui_diff insert end \
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[mc "* Binary file (not showing content)."] \
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d_@
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} else {
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if {$sz > $max_sz} {
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$ui_diff insert end \
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"* Untracked file is $sz bytes.
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* Showing only first $max_sz bytes.
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" d_@
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}
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$ui_diff insert end $content
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if {$sz > $max_sz} {
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$ui_diff insert end "
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* Untracked file clipped here by [appname].
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* To see the entire file, use an external editor.
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" d_@
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}
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}
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$ui_diff conf -state disabled
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set diff_active 0
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unlock_index
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if {$scroll_pos ne {}} {
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update
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$ui_diff yview moveto $scroll_pos
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}
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ui_ready
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return
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}
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set cmd [list]
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if {$w eq $ui_index} {
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lappend cmd diff-index
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lappend cmd --cached
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} elseif {$w eq $ui_workdir} {
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if {[string index $m 0] eq {U}} {
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lappend cmd diff
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} else {
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lappend cmd diff-files
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}
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}
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lappend cmd -p
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lappend cmd --no-color
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if {$repo_config(gui.diffcontext) >= 0} {
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lappend cmd "-U$repo_config(gui.diffcontext)"
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}
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if {$w eq $ui_index} {
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lappend cmd [PARENT]
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}
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lappend cmd --
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lappend cmd $path
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if {[catch {set fd [eval git_read --nice $cmd]} err]} {
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set diff_active 0
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unlock_index
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ui_status [mc "Unable to display %s" [escape_path $path]]
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error_popup [strcat [mc "Error loading diff:"] "\n\n$err"]
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return
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}
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fconfigure $fd \
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-blocking 0 \
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-encoding binary \
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-translation binary
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fileevent $fd readable [list read_diff $fd $scroll_pos]
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}
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proc read_diff {fd scroll_pos} {
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global ui_diff diff_active
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global is_3way_diff current_diff_header
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$ui_diff conf -state normal
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while {[gets $fd line] >= 0} {
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# -- Cleanup uninteresting diff header lines.
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#
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if { [string match {diff --git *} $line]
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|| [string match {diff --cc *} $line]
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|| [string match {diff --combined *} $line]
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|| [string match {--- *} $line]
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|| [string match {+++ *} $line]} {
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append current_diff_header $line "\n"
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continue
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}
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if {[string match {index *} $line]} continue
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if {$line eq {deleted file mode 120000}} {
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set line "deleted symlink"
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}
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# -- Automatically detect if this is a 3 way diff.
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#
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if {[string match {@@@ *} $line]} {set is_3way_diff 1}
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if {[string match {mode *} $line]
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|| [string match {new file *} $line]
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|| [regexp {^(old|new) mode *} $line]
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|| [string match {deleted file *} $line]
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|| [string match {deleted symlink} $line]
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|| [string match {Binary files * and * differ} $line]
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|| $line eq {\ No newline at end of file}
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|| [regexp {^\* Unmerged path } $line]} {
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set tags {}
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} elseif {$is_3way_diff} {
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set op [string range $line 0 1]
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switch -- $op {
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{ } {set tags {}}
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{@@} {set tags d_@}
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{ +} {set tags d_s+}
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{ -} {set tags d_s-}
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{+ } {set tags d_+s}
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{- } {set tags d_-s}
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{--} {set tags d_--}
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{++} {
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if {[regexp {^\+\+([<>]{7} |={7})} $line _g op]} {
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set line [string replace $line 0 1 { }]
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set tags d$op
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} else {
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set tags d_++
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}
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}
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default {
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puts "error: Unhandled 3 way diff marker: {$op}"
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set tags {}
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}
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}
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} else {
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set op [string index $line 0]
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switch -- $op {
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{ } {set tags {}}
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{@} {set tags d_@}
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{-} {set tags d_-}
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{+} {
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if {[regexp {^\+([<>]{7} |={7})} $line _g op]} {
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set line [string replace $line 0 0 { }]
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set tags d$op
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} else {
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set tags d_+
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}
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}
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default {
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puts "error: Unhandled 2 way diff marker: {$op}"
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set tags {}
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}
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}
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}
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$ui_diff insert end $line $tags
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if {[string index $line end] eq "\r"} {
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$ui_diff tag add d_cr {end - 2c}
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}
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$ui_diff insert end "\n" $tags
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}
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$ui_diff conf -state disabled
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if {[eof $fd]} {
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close $fd
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set diff_active 0
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unlock_index
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if {$scroll_pos ne {}} {
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update
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$ui_diff yview moveto $scroll_pos
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}
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ui_ready
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if {[$ui_diff index end] eq {2.0}} {
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handle_empty_diff
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}
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}
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}
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proc apply_hunk {x y} {
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global current_diff_path current_diff_header current_diff_side
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global ui_diff ui_index file_states
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if {$current_diff_path eq {} || $current_diff_header eq {}} return
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if {![lock_index apply_hunk]} return
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set apply_cmd {apply --cached --whitespace=nowarn}
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set mi [lindex $file_states($current_diff_path) 0]
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if {$current_diff_side eq $ui_index} {
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set failed_msg [mc "Failed to unstage selected hunk."]
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lappend apply_cmd --reverse
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if {[string index $mi 0] ne {M}} {
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unlock_index
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return
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}
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} else {
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set failed_msg [mc "Failed to stage selected hunk."]
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if {[string index $mi 1] ne {M}} {
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unlock_index
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return
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}
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}
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set s_lno [lindex [split [$ui_diff index @$x,$y] .] 0]
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set s_lno [$ui_diff search -backwards -regexp ^@@ $s_lno.0 0.0]
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if {$s_lno eq {}} {
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unlock_index
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return
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}
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set e_lno [$ui_diff search -forwards -regexp ^@@ "$s_lno + 1 lines" end]
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if {$e_lno eq {}} {
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set e_lno end
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}
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if {[catch {
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set p [eval git_write $apply_cmd]
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fconfigure $p -translation binary -encoding binary
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puts -nonewline $p $current_diff_header
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puts -nonewline $p [$ui_diff get $s_lno $e_lno]
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close $p} err]} {
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error_popup [append $failed_msg "\n\n$err"]
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unlock_index
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return
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}
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$ui_diff conf -state normal
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$ui_diff delete $s_lno $e_lno
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$ui_diff conf -state disabled
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if {[$ui_diff get 1.0 end] eq "\n"} {
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set o _
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} else {
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set o ?
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}
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if {$current_diff_side eq $ui_index} {
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set mi ${o}M
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} elseif {[string index $mi 0] eq {_}} {
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set mi M$o
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} else {
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set mi ?$o
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}
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unlock_index
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display_file $current_diff_path $mi
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if {$o eq {_}} {
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clear_diff
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} else {
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set current_diff_path $current_diff_path
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}
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}
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proc apply_line {x y} {
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global current_diff_path current_diff_header current_diff_side
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global ui_diff ui_index file_states
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if {$current_diff_path eq {} || $current_diff_header eq {}} return
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if {![lock_index apply_hunk]} return
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set apply_cmd {apply --cached --whitespace=nowarn}
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set mi [lindex $file_states($current_diff_path) 0]
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if {$current_diff_side eq $ui_index} {
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set failed_msg [mc "Failed to unstage selected line."]
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set to_context {+}
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lappend apply_cmd --reverse
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if {[string index $mi 0] ne {M}} {
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unlock_index
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return
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}
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} else {
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set failed_msg [mc "Failed to stage selected line."]
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set to_context {-}
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if {[string index $mi 1] ne {M}} {
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unlock_index
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return
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}
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}
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set the_l [$ui_diff index @$x,$y]
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# operate only on change lines
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set c1 [$ui_diff get "$the_l linestart"]
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if {$c1 ne {+} && $c1 ne {-}} {
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unlock_index
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return
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}
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set sign $c1
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set i_l [$ui_diff search -backwards -regexp ^@@ $the_l 0.0]
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if {$i_l eq {}} {
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unlock_index
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return
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}
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# $i_l is now at the beginning of a line
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# pick start line number from hunk header
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set hh [$ui_diff get $i_l "$i_l + 1 lines"]
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set hh [lindex [split $hh ,] 0]
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set hln [lindex [split $hh -] 1]
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# There is a special situation to take care of. Consider this hunk:
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#
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# @@ -10,4 +10,4 @@
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# context before
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# -old 1
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# -old 2
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# +new 1
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# +new 2
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# context after
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#
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# We used to keep the context lines in the order they appear in the
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# hunk. But then it is not possible to correctly stage only
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# "-old 1" and "+new 1" - it would result in this staged text:
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#
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# context before
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# old 2
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# new 1
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# context after
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#
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# (By symmetry it is not possible to *un*stage "old 2" and "new 2".)
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#
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# We resolve the problem by introducing an asymmetry, namely, when
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# a "+" line is *staged*, it is moved in front of the context lines
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# that are generated from the "-" lines that are immediately before
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# the "+" block. That is, we construct this patch:
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#
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# @@ -10,4 +10,5 @@
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# context before
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# +new 1
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# old 1
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# old 2
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# context after
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#
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# But we do *not* treat "-" lines that are *un*staged in a special
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# way.
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#
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# With this asymmetry it is possible to stage the change
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# "old 1" -> "new 1" directly, and to stage the change
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# "old 2" -> "new 2" by first staging the entire hunk and
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# then unstaging the change "old 1" -> "new 1".
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# This is non-empty if and only if we are _staging_ changes;
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# then it accumulates the consecutive "-" lines (after converting
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# them to context lines) in order to be moved after the "+" change
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# line.
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set pre_context {}
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set n 0
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set i_l [$ui_diff index "$i_l + 1 lines"]
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set patch {}
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while {[$ui_diff compare $i_l < "end - 1 chars"] &&
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[$ui_diff get $i_l "$i_l + 2 chars"] ne {@@}} {
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set next_l [$ui_diff index "$i_l + 1 lines"]
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set c1 [$ui_diff get $i_l]
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if {[$ui_diff compare $i_l <= $the_l] &&
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[$ui_diff compare $the_l < $next_l]} {
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# the line to stage/unstage
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set ln [$ui_diff get $i_l $next_l]
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if {$c1 eq {-}} {
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set n [expr $n+1]
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set patch "$patch$pre_context$ln"
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} else {
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set patch "$patch$ln$pre_context"
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}
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set pre_context {}
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} elseif {$c1 ne {-} && $c1 ne {+}} {
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# context line
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set ln [$ui_diff get $i_l $next_l]
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set patch "$patch$pre_context$ln"
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set n [expr $n+1]
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set pre_context {}
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} elseif {$c1 eq $to_context} {
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# turn change line into context line
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set ln [$ui_diff get "$i_l + 1 chars" $next_l]
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if {$c1 eq {-}} {
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set pre_context "$pre_context $ln"
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} else {
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set patch "$patch $ln"
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}
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set n [expr $n+1]
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}
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set i_l $next_l
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}
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set patch "@@ -$hln,$n +$hln,[eval expr $n $sign 1] @@\n$patch"
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if {[catch {
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set p [eval git_write $apply_cmd]
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fconfigure $p -translation binary -encoding binary
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puts -nonewline $p $current_diff_header
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puts -nonewline $p $patch
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close $p} err]} {
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error_popup [append $failed_msg "\n\n$err"]
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}
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unlock_index
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}
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